Questions about the bonus quests feature

Hello there community!
I have some questions regarding the bonus quest feature here on Warmane:

Is there a bonus quest for every area?
Can you restore them once abandoned?
Do you only get them to a certain level / are they level capped for getting them?
Does it matter when you finish them or do the rewards scale with your level anyway?

Thank you and best regards!

Nope, there is no such thing.

I think that there is something like that in Frostmourne although I have no idea of how it works. At least based on this other thread: http://forum.warmane.com/showthread.php?t=447575